A structural study of ceramics in the (BiMnO3)x–(PbTiO3)1−x solid solution series

Ceramics in the (BiMnO3)x–(PbTiO3)1−x series were fabricated with compositions in the range . A macroscopically pseudocubic structure was observed for compositions x>0.4 while at x<0.4 the structure is tetragonal. The presence of a pseudocubic structure is attributed to frustration between different preferred environments of cations, leading to an absence of long-range ordered polar ionic displacements. Microstructures similar to those of relaxors were observed at x = 0.4 and evidence of incommensurate ordering of antiparallel cation displacements was found at compositions . Permittivity measurements for x = 0.3 and 0.4 revealed diffuse frequency-dependent maxima between 100 and 300 °C. In addition, compositions with exhibited a sharp peak at higher temperature. The broad peaks are considered to arise from different time constants attributed to the grain interiors and boundaries for x = 0.3 and 0.4 whereas the sharp peak is interpreted as the Curie temperature of a tetragonal to cubic phase transition.

[1]  Thomas R. Shrout,et al.  New High Temperature Morphotropic Phase Boundary Piezoelectrics Based on Bi(Me)O3–PbTiO3 Ceramics , 2001 .

[2]  D. J. Barber,et al.  Transmission electron microscope studies of phase transitions in single crystals and ceramics of ferroelectric Pb(Sc1/2Ta1/2)O3 , 1990 .

[3]  T. Proffen,et al.  Measurement of the local Jahn-Teller distortion in LaMnO 3.006 , 1999, cond-mat/9903084.

[4]  D. Jarosch.  Crystal structure refinement and reflectance measurements of hausmannite, Mn3O4 , 1987 .

[5]  P. Moore,et al.  Braunite; its structure and relationship to bixbyite, and some insights on the genealogy of fluorite derivative structures , 1976 .

[6]  Randall,et al.  Incommensurate structures in highly ordered complex perovskites Pb(Co1/2W1/2)O3 and Pb(Sc1/2Ta1/2)O3. , 1989, Physical review. B, Condensed matter.

[7]  Anthony K. Cheetham,et al.  Evidence for the likely occurrence of magnetoferroelectricity in the simple perovskite, BiMnO3 , 2002 .

[8]  I. Reaney,et al.  Domain variance and superstructure across the antiferroelectric/ferroelectric phase boundary in Pb_1−1.5xLa_x(Zr_0.9TiM_0.1)O_3 , 2003 .

[9]  A. M. Glazer,et al.  The classification of tilted octahedra in perovskites , 1972 .

[10]  I. Reaney,et al.  Crystal and domain structure of the BiFeO3-PbTiO3 solid solution , 2003 .

[11]  I. Reaney,et al.  Investigation of a high Tc piezoelectric system: (1−x)Bi(Mg1/2Ti1/2)O3–(x)PbTiO3 , 2004 .

[12]  William E Lee,et al.  Domain structure-property relations in lead lanthanum zirconate titanate ceramics , 1996 .

[13]  John T. S. Irvine,et al.  Electroceramics: Characterization by Impedance Spectroscopy , 1990 .

[14]  A. Halliyal,et al.  Investigation of tetragonal distortion in the PbTiO_3–BiFeO_3 system by high-temperature x-ray diffraction , 1995 .

[15]  K. Ohoyama,et al.  Structure determination of ferromagnetic perovskite BiMnO3 , 1999 .